Stop Seasonal Depression In Its Tracks with Vitamin D3 and B12

Have you ever noticed the allure of summer compared to winter? Certainly, the warmth, memories of school-free summers, and outdoor events contribute to the appeal of this season. However, these sunny months can also positively impact our mood. Seasonal Affective Disorder, aptly abbreviated as "SAD," is a form of seasonal depression often associated with a lack of vitamin D, a nutrient synthesized through sun exposure. This winter, consider addressing vitamin D levels without depending solely on a tropical escape. Combat seasonal changes with the support of vitamin D3 and B12 supplements.

What are the symptoms of SAD?

Seasonal depression, as the name suggests, is a form of depression that manifests seasonally, often during the winter months. Some may attribute this melancholy to the "winter blues," a result of spending more time indoors with fewer warm gatherings or leisurely days at the beach or park. While reduced social interaction and activities can contribute to seasonal depression, its root cause is often biological. Seasonal depression, also known as Seasonal Affective Disorder (SAD), is influenced by three primary factors:

  1. Interruptions to your circadian rhythm: Winter-onset SAD may be triggered by reduced sun exposure in fall and winter, disrupting your body's internal clock, or circadian rhythm.

  2. A drop in serotonin levels: SAD may involve decreases in serotonin, a neurotransmitter influencing mood.

  3. Decreased melatonin levels: Melatonin, a hormone regulating the sleep-wake cycle, can be affected by seasonal changes and reduced sunlight, impacting sleep patterns and mood.

How is SAD different from Major Depressive Disorder?

Seasonal affective disorder is a subtype of depression associated with changes in seasons, displaying symptoms that manifest and subside at roughly the same time each year. According to the Diagnostic Manual of Mental Disorders (DSM-5), SAD is categorized as a variant of depression, specifically Major Depressive Disorder with a Seasonal Pattern. Consequently, many symptoms of SAD align with those of depression, encompassing:

  • Feelings of depression nearly every day

  • Loss of interest in hobbies

  • Low energy levels

  • Difficulty falling asleep

  • Changes in appetite

  • Unexplained weight gain or loss

  • Irritability and fatigue

  • Difficulty concentrating

It is crucial to recognize that seasonal depression surpasses the typical winter blues, warranting serious attention. While it might appear that sunshine and warm weather could dispel seasonal depression, its effects can persist throughout the year and may exacerbate if not addressed appropriately.

What are the benefits of taking vitamin D3 for Seasonal Depression?


Similar to many mental health issues, several factors can trigger or exacerbate symptoms. When it comes to seasonal depression or SAD, insufficient vitamin D, often referred to as the sunshine vitamin, might be a significant factor. A 2018 meta-analysis discovered a correlation between low vitamin D levels and depression. Additionally, individuals with Alzheimer's disease often exhibit vitamin D deficiency. Vitamin D synthesis occurs when our skin is exposed to sunlight. Unfortunately, many people in the Northern hemisphere experience limited sun exposure, making it easier to become vitamin D deficient. In fact, an estimated 1 billion people globally are deficient in vitamin D.

Regrettably, maintaining a well-balanced healthy diet alone may not provide optimal vitamin D levels. Dietary sources of vitamin D are limited and include fatty fish like salmon, fish liver oils, egg yolks, and vitamin D-enriched milk and cereals. Alternatively, since vitamin D can be produced through light exposure, light therapy may serve as an effective treatment. This involves sitting in front of a bright light box for 20-60 minutes to simulate sun exposure while indoors. According to the Mayo Clinic, light therapy is believed to impact brain chemicals associated with mood and sleep, alleviating SAD symptoms. However, it's important to note that light therapy may have side effects such as headache, dizziness, or nausea. This treatment is also more time-intensive compared to other options like vitamin D supplementation. Vitamin D supplements are available in easy-to-swallow pill forms, making it convenient to meet the recommended daily allowance with your morning breakfast. The Recommended Dietary Allowance (RDA) of vitamin D is:

  • Age 0-12 months: 10 mcg

  • Age 14-70 years: 15 mcg

  • Ages 70 and up: 20 mcg

However, some studies suggest that a higher daily intake of 1,000–4,000 IU (25–100 micrograms) is necessary to maintain optimal blood levels. It's advisable to consult with your health care provider before adding a new supplement to your diet, especially if you take medication. Explore our blog to learn about the benefits of combining Vitamin K2 and D3.

Boost Your Mood with Vitamin B12

Vitamin B12 may offer relief for those deficient in this vitamin and experiencing seasonal depression. It plays a crucial role in synthesizing serotonin, a mood-regulating neurotransmitter. Deficiency in vitamin B12 can lead to depression, sadness, and fatigue. Studies suggest that supplementation, along with antidepressant medications, may benefit individuals with a deficiency (which ranges from 3% to 43% among older adults). Other research supports the correlation between vitamin B12 deficiency and depression, indicating that those deficient in Vitamin B12 have twice the risk of severe depression.


Dietary sources of vitamin B12 include beef, liver, chicken, fish such as trout, salmon, tuna, and clams, fortified breakfast cereal, low-fat milk, yogurt, cheese, and eggs. Vitamin B12 supplements provide a quick and reliable way to address this nutritional gap. Consider 1 Body's Vitamin B Complex supplement, containing not only vitamin B12 but also vitamin B6, B1, B2, B5, Niacin, Folate, and Biotin, supporting energy levels and overall health.

Other Supplements to Consider

Other supplements may help to manage the symptoms of seasonal affective disorder and support general health and wellness. Other supplements worth considering include: Omega-3 Fatty Acids: According to a study conducted by the University of Pittsburgh Medical Center, those with a higher amount of omega-3's in their system were less likely to report feelings or symptoms associated with depression. St. John's Wort: Preliminary studies have identified St. John's Wort, a natural supplement created from a flowering plant, as a potential mood and sleep booster. However, this supplement may interact with other medications so be sure to consult a doctor before adding it to your diet. Folic acid: Folic acid plays an integral function in the brain by helping to produce S-adenosylmethionine (also known as SAM-e), a compound that produces "happy hormones" such as serotonin, dopamine, and norepinephrine. More clinical trials are needed to truly measure its efficacy in treating and improving the symptoms of SAD.

Seasonal affective disorder is a significant mental health concern that requires attention. If you are experiencing depression or another mood disorder, it's crucial to consult with a medical professional. They can assess your condition, including testing your blood levels of vitamins D and B12, and recommend an appropriate treatment plan. This may involve interventions such as antidepressants, cognitive-behavioral therapy, or other approaches. Rather than waiting for the winter blues to impact you, prioritize your well-being by maintaining a healthy diet, considering mood-supporting supplements under professional guidance, engaging in regular exercise, and staying proactive about your emotional and mental health.

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